FIELD: chemistry.
SUBSTANCE: invention relates to a method of separating alkane and alkene fractions, possibly containing alkadiene impurities, using extraction rectification in the presence of polar extraction agent(s), wherein the basic amount of alkanes comes out in a distillate stream, and the basic amount of alkenes comes out in a strippant stream distilled from the extraction agent. The method is characterised by that before extraction rectification, the larger part of 1-alkene(s) in the alkane and alkene fractions is isomerised and/or hydroisomerised to 2-alkene(s) at temperature not above 100°C in the presence of heterogeneous catalyst(s) with activity during positional isomerisation of alkene, and possibly a small amount of polar substance which does not deactivate the catalyst(s).
EFFECT: more efficient separation of alkane and alkene mixtures through extraction rectification.
11 cl, 13 ex, 1 dwg
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